/*
 * Copyright (C) 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.cloud.teleport.v2.spanner.migrations.utils;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;

import com.google.cloud.teleport.v2.spanner.migrations.transformation.TransformationContext;
import com.google.common.io.Resources;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import org.apache.beam.sdk.testing.TestPipeline;
import org.junit.Rule;
import org.junit.Test;

/** Tests for TransformationContextReaderTest class. */
public class TransformationContextReaderTest {
  @Rule public final transient TestPipeline pipeline = TestPipeline.create();

  @Test
  public void readTransformationContextFile() throws Exception {
    Path transformationContextPath =
        Paths.get(Resources.getResource("transformation-context.json").getPath());
    TransformationContext transformationContext =
        TransformationContextReader.getTransformationContext(transformationContextPath.toString());
    TransformationContext expectedTransformationContext = getTransformationContextObject();
    // Validates that the transformation context object created is correct.
    assertThat(
        transformationContext.getSchemaToShardId(),
        is(expectedTransformationContext.getSchemaToShardId()));
  }

  private static TransformationContext getTransformationContextObject() {
    Map<String, String> schemaToShardId = new HashMap<>();
    schemaToShardId.put("shard1", "id1");
    schemaToShardId.put("shard2", "id2");
    TransformationContext expectedTransformationContext =
        new TransformationContext(schemaToShardId);
    return expectedTransformationContext;
  }

  @Test
  public void readEmptyTransformationContextFilePath() throws Exception {
    String transformationContextPath = null;
    TransformationContext transformationContext =
        TransformationContextReader.getTransformationContext(transformationContextPath);
    TransformationContext expectedTransformationContext = new TransformationContext();
    // Validates that the transformation context object created is correct.
    assertThat(
        transformationContext.getSchemaToShardId(),
        is(expectedTransformationContext.getSchemaToShardId()));
  }
}
